Fillet of any fish, my carp, sprinkle with salt and pepper + seasoning for fish + lemon juice ( optional) marinate at least 25 minutes. Prepare the sauce: fry onions with mushrooms until done, as these adversaries are fried very quickly and all the time and strive to burn from the stove do not leave!! now add the cheese (grated on a coarse grater) and mayonnaise (sour cream) can even be fifty-fifty. Mix well and cover our fish directly on the baking tray, previously greased. Estimated time 200 gr. 25 minutes. Adieu!! The next outrage is ready!!!